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Ralph
08-18-2001 18:59:21
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Re: 35 diesel--Glow Plugs???? in reply to Niagara Bob, 08-17-2001 07:30:45
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The MF35 had only one heating plug (glow plug)located in intake manifold. The starter switch in the dash,(by turning counter-clock wise), supplied power for the glow plug. When operating the glow plug, the amp gauge in the dash would show the amps that the glow plug was pulling from the battery. Diesel fuel was piped to the heating plug to help increase the temperature of the air in the intake manifold. You can actually hear the fuel ignite when the glow plug is working correctly. It helps to view the difference in the MF35 and 135 to understand the glow plug.
The Perkins in the MF35 was know as a Pre-combustion Engine. The MF135 was know as a Direct Injection Engine. The difference, on the MF35's, diesel fuel was injected into a chamber call the pre-combustion chamber, where the fuel would ignite and the gases enter the cylinder thru the opening in the pre-combustion chamber. On the MF135, the fuel was injected directly into the cylinder. The MF35 was hard to start in cold weather because some compression is lost when the compressed air was forced into the pre-combustion chamber. This lost of compression resulted in a lower temperature of the air in the cylinder. The MF135 had more compression because there were no pre-combustion chambers to fill resulting in higher temperatures on compression stroke. This made starting in cold weather much easier.
I have notice Cat engines built over the past 40 years and the pre-combustion engines, in my opinion, have a longer life span. I have seen less piston failures on the pre-combustion engines because the combustion,(ignition),takes place in the chamber,not in the cylinder like the Direct Injection engines. These Cat engines with the pre-combustion chambers had the same nature as the MF35 engine, hard to start in cold weather. The heating plug, (glow plug), needs to be in good working order to start the engine during low temperatures. Good luck!
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